I have participated in various forums, but by far the two most valuable and enjoyable ones for me are Bike Forums (mostly C&V and 50+, but I do visit some of the others from time to time) and Passatworld, which has saved me a ton of money and time on the cars (1996 Audi A4 Quattro and 2001 VW Passat wagon). (Pictured: Austrian bike with German cars.

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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069